Performance of HEPA filters under severe conditions. (VII). Pressure transients test.

Performance of Multiple HEPA Filters Against Plutonium Aerosols

Field sampling has provided C. Elder, and Manuel Gonzales general criteria defining plutonium aerosol size characteristics and activity concentrations from typical plutonium operations. Two fabrication facilities have aerosols with activity median aerodynamic diameter’s (amad) ranging from 2 to 5 pm; the two research and development facilities indicate amad’s ranging from 1 to 4 ~; and a recove...

Performance of breathing filters under wet conditions: a laboratory evaluation.

INTRODUCTION Heat and moisture exchangers in combination with a bacterial and viral filter (HMEF) are widely used during general anaesthesia. Excess patient secretions occluding the HMEF have been responsible for previous case reports of airway obstruction. A previous study suggested that differences in HMEF design might contribute to filter obstruction under wet conditions. METHODS We tested...

High performance under pressure.

The effects of Concept Mapping Strategy and Aural Vs. Written Prompts on Writing Test Performance Under Different Planning Conditions

This study examined the effects of aural and written prompts under two planning conditions (i.e. pre-task planning and no planning) on complexity, accuracy, and fluency of test takers' writing production. Forty learners in an English institute, who had already been classified as intermediate according to the Oxford Placement Test, were assigned to two planning conditions (i.e. no planning and p...

Manual Performance under Cold Conditions

The purpose of this study was to investigate manual performance and thermal responses during low work intensity in persons wearing standard protective clothing in the petroleum industry when they were exposed to a range of temperatures (5, –5, –15 and –25°C) that are relevant to environmental conditions for petroleum industry personnel in northern regions. Twelve men participated in the study. ...